1 John 4:7-21 is pretty clear on that point, most explicitly verse 8 (NIV):

Whoever does not love does not know God, because God is love.

The context is him presumably addressing a specific community, but I find it hard to conclude that this instruction should only apply to believers, given that other verses in the epistle talk about God's love for the world, not just those people that confess faith in him.

The parable of the Samaritan, told in answer to the question who the "neighbour" in "love your neighbour" is, frames someone from a hostile kingdom as a better person than the holier-than-thou zealots, because he helped someone regardless of conflicts of faith.

I could dig out more quotes to that effect, if I had the time, but my point is that the bible pretty clearly endorses being friendly and respectful to everyone, whether or not they abide by the faith. So even if someone believed that queers are sinners or whatever, I can't see any justification for hate or discrimination.

I'm not Christian anymore, but this is a particular point that stuck with me beyond all questions of faith.