Sounds like you have nothing to worry about. A lot of poor sportsmanship here especially at the lower levels. They don't allow any discussion of cheating here in the general forums. I'll get a link for you though if you're really worried...
Opponent said they'd report me for cheating.
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Recent game I played I beat someone with no mistakes but I did make 1 blunder. He resigns after a series of quite catastrophic moves that solidifies my lead but first messages me saying that he's gonna report me as it's very unlikely someone at our level (rating ~700) would not make any mistakes. The game report only had me at ~60% accuracy.
I'm scared this will somehow mar my account or lead to a ban and don't know if there's something I can or should do. Should I be worried?
I'm completely new to chess, started playing after watching pogchamps stuff like 3 weeks ago as a complete beginner, I only knew how pieces moved. No openings, no theory, I didn't really understand castling so as such I set myself on lowest starting rating.
I think I've improved quite quickly and even had some 90% games against opponents that played badly enough to make my move obvious but I'm definitely no expert. I'm wondering if those game percentages will be taken at face value and not help my case.