Ephesians 5; 6-11 We are to have no fellowship with the workers and advocates of darkness and evil but are rather to reprove, mark and avoid them. Enabling is partaking.
Verse 7 says: "Therefore do not be partners with them."
and
Verse 11 says: "Have nothing to do with the fruitless deeds of darkness, but rather expose them."
The scriptures seem to be saying to not agree with them, nor to have anything to do with their deeds, but rather admonish them. It does not say we are to have nothing to do with the people themselves. For instance, I chose to not attend parties or get-to-gethers where there will be activities that I count as sinful. Yet, I would welcome the chance to have lunch, for instance with some of those same people, one-on-one, and talk to them about why I didn't attend the party and why following Jesus means so much to me.
Remember that Jesus went among the sinners. If we cut off all interaction with acquaintances and family members who support the LGBT movement, then how will be able to witness to them or even admonish them? I guess there are various degrees or definitions of "fellowship", and I truly believe God would not have us give up on friends and relatives who we love and want to witness to.
I strongly emphasize that we are to hate the sin, not the sinner.