Well, Dirk, as a character, completely changed in the Epilogues and Beyond Canon without any warning. OP does have a valid point in that there's nothing wrong with Dirk being "problematic" or a villain, but the way he is portrayed and the fact that he is also heavily centered around his identity as a gay man is kind of offensive. Also, I just don't think OP was saying that @JakeMorph.

This is a post about the way they are portrayed, not whether or not how they're portrayed is "realistic" or whatever, and how that portrayal made real gay men feel when reading it. I will say that I do like Dirk as a villain, but I will not deny that there are plenty of examples in the Post Canon material that paint certain characters with a large stereotypical brush that did offend real people who were fans reading it (coughJadecough)

And some of the writing choices for DirkJake and Davekat also leaned into that territory a bit. You are totally fine to still like those aspects of the story, though, and nobody is saying that enjoying these aspects of their character or wanting them to be further explored is bad. Just that it's kind of there, and the OP doesn't really like that aspect of the story.

I also think it is fair to say that it is a bit of "two things are true" here. Yes, Dirk is very much a patriarchal figure, but it is also not lost on me that in his villain, he has forced a sapphic woman out of a relationship and used very lesbophobic language when speaking about her previous marriage (He treats Kanaya and Rose's marriage as inconsequential and meaningless, saying it wasn't going to last, etc. Yes, I know he was saying this just because he needed Kanaya to leave Rose, but it is also just a common phrase men will say to women in gay relationships, saying they're not serious enough or that it doesn't matter is a very common bigoted thing men say about them.) He is also incredibly flippant about her and Terezi being together in any romantic capacity, and yes, there is context within the larger story as a whole to explain all of this away, but it does not really remove the offensiveness for some readers.

In the same way that Homestuck uses slurs in a way to show how other characters may feel about each other, it's valid for someone to be uncomfortable with reading that, and even for them to think that perhaps the comic shouldn't have used them at all.