I wouldn't stress it. I've been dragged into so much drama here I can't even remember who said what. I judge people by if they're honest, contributing to Bitcoin, and they can respect others' efforts to make a difference. I frankly don't have the memory skills to hold a grudge.
First off, I never purchased any Bitcoin until the pandemic this year, where I bought 0.2 BTC (I think) for a friend. All of the BTC I have comes from gifts or earnings. As far as my biggest regret... I wouldn't really say I have any. I'm sure everything that happened happened for a reason and that is why I'm still here. If I cared about things like being popular or liked here the clear regret would be that I didn't create an alt account like everyone else to stand up against lies and broadcast my non-herd opinions while remaining well liked under my main account. Withdrawing all my BTC from mtgox before the bankruptcy might be a decent cause for regret, but I probably would've spent all those coins on something stupid so even that will probably turn out to be a positive.
I came long after the beginning. I was very much a newbie years after theymos took control of the forum and with respect to forum politics, I am still a newbie.