Here is blanket permission to not worry very much about offending people who neither show up to your parties nor ever explain why.
How to plot the accumulated costs of "useless objects" vs. "pointless arguments" over time?
People who won't take 'no' for an answer often present the risk as you being seen as mean or selfish when you don't do what they want, when really, it's that if you don't say 'no' you have to put up with them in your personal space. Re-balance your risk assessments, friend!
When someone says "I don't have romantic feelings for you," take them at their word.
Sometimes when you stop trying to make yourself like someone, it's easier to keep the peace at parties.
"I hated living with them so I moved the hell out. What is there to 'mediate?'"
What to do when everyone you know is getting vaccinated, except for you? What about when you're the relatively fortunate person? Also, what about relatives who refuse to be immunized? Here are some thoughts about that.
"Don't touch me" isn't complicated. You know who makes it complicated? CREEPS, THAT'S WHO.
There's a lot to be said sometimes for faking it until you make it, but I'm a big fan of dropping the act and dropping the shame right along with it.
If you don't know what to say, revert to first principles: Something is probably better than nothing.