@hightor,
These terms are meaningless to a debate... particularly online.
1) If someone is demanding answers to questions, I simply answer the questions one by one. Hightor, I think you have complained about me "not answering your questions". When this happens I don't accuse you of "sealioning", I simply go back and answer the questions (or ignore them if I don't care).
2) If someone is talking down to me or condescending, I simply ignore it. Online this means either skipping over the words... or (if I choose) pointing out any errors.
3) In a "both sides" argument... if the other side is factual, I will simply move on.
Facts on both sides of an issue count and a fact is true no matter which side says it. I might say it is irrelevant (if I believe it is irrelevant) or I can ignore it.
The problem is when these terms are used to exclude other perspectives. The label "bothsidesism" is used to exclude inconvenient facts from a discussion. And that is a bad thing for intelligent discussion but a good thing for maintaining a narrow one-side view.