UseTheBlacklist said:
Using words like ゲロ as an adverb, "w" and using that particular dialect tend to come across as rude, especially when it's the first we talked to each other. I thought you would know those things if you speak Japanese that fluently.

Oh, was the dialect the problem? I remember hearing from a coworker that in anime characters tend to use kantou speech unless they're gangsters, because kantou speech is the primary dialect right now and there were more gangsters in kansai back in the day. Did you by chance assume kansai speech is some rowdy way of talking, and that I was imitating fictional characters? I feel that could've caused a pretty big misunderstanding　(:_;)

@wwwwwwwww: Sorry I didn't notice your replies.

ゲロ甘 is a normal word but it's still considered rude. And 鼻糞 is not relevant at all because there are many other ways to say "too sweet" and you decided to choose that one.
Yes, I asked you to speak in your favourite language but I never asked you to answer in an aggressive way, did I? Even on Twitter, if a stranger talks to me like that, I'll assume that person is very arrogant.
Also there are two ways to say "lol" in Japanese. "w" has more negative nuances while "笑" is neutral.

So yeah, it's not only that dialect. But the combination of those 3.
Just please be careful when you talk to me in Japanese ever again. I'm extremely fluent in that language so I'll pick up on nuances you don't fully understand/know.