I'm sorry, I'm dipping in, but with 'academic' language, I think there are two things.
One is, people are socialised to use language differently. When I'm completely on top of an idea, I find I can and should use simple but precise language to explain it. Then, I might get frustrated with someone who insists on using an important term to mean something different from what I think it means - and we'll need to have that out before we can go further. I think that's normal miscommunication of one kind.
The other thing is, though, that we don't all respond the same way (and as individuals we respond different ways at different times) to things we don't yet fully understand. I know I am more likely to repeat a bit of fancy language if I'm clinging onto it for dear life because if I paraphrase, I'll completely lose what I was thinking about. I think everyone does this, right?
The problem is, this can sound awfully like the MRA-types who come in with their '@LRD, I find your solipsism to be verbose but etiolated' kind of bollocks, when what they mean is 'I know long words and I will cram them in to a sentence for the sake of it'.
This particular debate about transphobia badly falls foul of all of these, because those of us who use simple, direct language with precise terms (on both sides) tend to make the people in the middle feel alienated, because they're still wanting to cling to phrases that might make sense, like 'performativity'. I just wanted to say, that's not a bad thing to do. It's not necessarily a snobby, 'ooh, look, I'm so well-read/good at third-wave terminology', it might just be what people do before they break the ideas down into their own words.