You called them a transphobe when all they wrote was "I’m not supporting LRG after what they did to that community manager". No room for discussion huh? Your whole reply was "they are transphobe, just trust me bro. so is OP."
They defended their position by bringing up some of the things people have a problem with that they think are fine, like being excited about the Harry Potter game and following a couple of conservative accounts. No transphobia so far. What about the 7 year old tweet that someone who doesn't like the Harry Potter franchise dredged up? If they had that opinion 7 years ago, they might have it today. Does it make you a transphobe if you don't believe the person should have been fired for this? It's not the same as agreeing with the tweet.
Is it something you're willing to discuss here, or is anyone who disagrees with your yet to be revealed argument "terrible" and "transphobic"? Attempting to antagonise and belittle anyone who doesn't share your view is reddit behaviour. It certainly won't get anyone on your side who didn't already agree with you, so I guess you want to make them feel bad, or it makes you feel good?
The problem I have is your criteria for labelling someone a transphobe.
Are you a moderator here?