The problem is that they are imposing their beliefs on others. Kindergarteners are now being taught about LGBT and as they advance they are being taught LGBT sex acts. They go after Christian businesses and not only shut them down, but some threaten them with arson and death. In Oregon a Christian baker was not only forced to close her business, a judge recommended that she pay $135,000 -- an amount so high that she and her family will be forced to live in poverty. When supporters started a crowdfunding campaign on GoFundMe, GoFundMe shut it down. LGBT extremists have gone after several other Christian business owners, but as far as I know I have heard of a single case where a gay couple demanded that a Muslim bakery cater to them. LGBT activists have also tried to rewrite American history and put in school textbooks, like claiming that Abraham Lincoln was gay. There are plenty of other examples where they FORCE their beliefs on others.
There are extremists on every side of every argument, be it "creationism vs. evolution" or "traditional marriage vs. gay marriage." As I stated, I'm not religious, and my religious friends and family members respect that and don't try to force their beliefs on me. But then there are incidents where someone will try to force their beliefs on me, and it pisses me off. So I can understand the outrage at those in the LGBT community trying to force their agenda on the masses. It's one thing to promote equality. It's an entirely different thing to go out of one's way to harm or negatively affect someone who doesn't agree with them. So I'm with you on that, but I'd also extend that anger towards any sort of extremist.