Provide the evidence. ...from a reputable source, like from a university physics department, or a Nat'l/Int'l Lab.
Re: Mass is energy
"Well, then photons have mass."
No. Mass is a particular set of properties that some members of the set of real particles arising out of energetic fields have. Mass indicates that a particle arising out of an energy field can remain stationary and the particle requires energy to be transferred to it in order to accelerate and an energy release to decelerate. The set is real particles, which has more members than just massive particles.
Mass is the result of a particle's energy coupling with a uniform, non-directional(scalar) field of the vacuum called the Higgs field. The Higgs field can be considered as the lowest energy state of the vacuum after the BB, and is a coupling of particle energy to the compactified dimensions of space. That means that some of the particle's energy exists in the compact dimensions of space/vacuum. In order to accelerate a massive particle, energy must be transferred to the particle to occupy at least 7 compacted dimensions and the 4 dimensions of extended space. That increase in energy with velocity, which must be partitioned and transferred to compacted space, results in a mass increase of the particle, from it's initial inertial state of mo.
A Photon is a force carrier that has no mass. It is a facilitator of electromagnetic(EM) energy transfer between massive particles with an EM component in this world. ie. those particles outside the vacuum. Unlike massive particles, their propagation velocity does not depend on their energy. A photon's velocity is simply determined by polarization interactions with the vacuum. Vacuum polarizations act as a reversible drag process. The average of the polarization interactions are the vacuum's electric permittivity(εo) and magnetic permeability(μo) constants. The speed of light is determined by those two numbers:
c=1/sqrt(εoμo)
Re: Space expands, because of the negative pressure of the vacuum
"You mean to tell me you understand what that means?
Yes.
" What is negative pressure in a vacuum?
Space is observed to be expanding. See Hubble's Law. Space is the vacuum. The BB was a phase transition; where the energy that comprises particles, arose out of the vacuum at the time of the BB are a different phase than that of the vacuum. The new phase is embedded in the vacuum and the gravitational field is an image of that phase on the vacuum. The image is formed by causing the extended dimensions to increase their curvature locally and the compacted dimensions to undergo an angular displacement, both in accordance with the local energy/momentum content.
That energy momentum content is represented by the stress-energy tensor of GR, Tμν. T00 is the local energy density(ρ) and Ti,j, where (i=j=1,2,3), is the normal stress/(unit area) in the ith direction.
In order to determine what the pressure in the vacuum is, one must first note that the vacuum must look the same to all inertial observers. That means any coordinate transformation must result in an invariant p and ρ and that ρ=-p. The fig. below from Ned Wright, UCLA, shows the calc. β and γ are Lorentz factors that aren't important here and c can be set to one. After that, one must have data on the actual energy density of the vacuum, which is found from observing Hubble redshift data-the observed expansion of space.
Observations show that the effective energy density is slightly positive and close to zero. That means the pressure of the vacuum is negative. What does that mean? It means the vacuum is pulling itself back together and "expelling" the embedded energy of this world and it's gravitational field. It means that the internal binding energy of the vacuum is greater than the gravitational force between gravitationally bound groups of matter/energy, such as galaxies and clusters... All the energy of this world is being isolated, to be left to radiate back into the vacuum as entropic noise.
The pressure doesn't represent vacuum fluctuations, other than the level and particular energy distribution that results from the difference in cohesive energy density between the vacuum and the energy that comprises this world.
Above for fair use by noting © Scott Stillwell(spunkets)(2011)
Work fig from Ned Wright, UCLA. 
Work fig from Ned Wright, UCLA.
" I am waiting for more copy and paste rubbish."
You already posted it. Do you think if it's posted, you won't see it again 'till I post it back to you?
Re:"Quantum mechanics does describe the world, regardless of your analogy.
So does the Ptolemaic navigational system. And even though it's based on geocentric universal model, it still works. Just because a working model works doesn't mean it describes the world the way it is."
QM is a fundamental and general theoretical body of knowledge that can be used to describe the relevant physics of anything in the universe.
Re: "GR does describe gravity and how one would experience it. ...In spite of your analogy."
"So, how we experience things is how the world really is? Can we get any more narcissistic?"
The equivalence principle comes to mind; especially in connection with falling elevators.