[Finny]

The RINO's WHAT? Are the RINO's (that is, the things belonging to a RINO) RINO's (belonging to the same RINO or a different RINO?) and what does weak have to do with whatever it is that this RINO owns?

Or do you mean RINOS? As in, a bunch of people who are Republican In Name Only?

There's a big difference between RINO'S and RINOS.

[beebuster2000]

you forgot to explain RINOS’

[YogicCowboy]

If you are going to focus on that rather than the larger issue, then I will as well:
RINO is an acronym; it is capitalized because each letter represents the first letter of a word: Republican In Name Only.
The ‘s’ in the pluralization of such an acronym is at the end of a word (whether ‘Republican’ or ‘Only’); thus the apostrophe marks not a possessive form but a contraction form of a word.
I happen to write plurals of acronyms this way and for that reason.
Regardless, did you really find the post incomprehensible on that point? I would not, even if I agreed with your grammatical argument.