Disagreeing? This is hardly about disagreeing with gay people. Gay people are trying to overcome decades of dehumanization, exclusion from their families, denial of their talents in the workplace and discrimination, casual violence anywhere that threatens their lives and systemic bigotry where even getting a cake baked for a celebration turns into a nasty lesson in religious prejudice. The cruelty against gay people is deep, and unpredictable. You REALLY think gay people shouldn't be upset about it?
Especially when you call such unprovoked, insane viciousness against them 'disagreement'?