Blocking users?
 

Is there a way to block people who are being abusive?

(Didn't expect to have to ask that on a forum for professionals!)

Use the Red Triangle 🔺 on the left hand side of the offending thread to complain.
Debate can robust as you found out in 2012 when discussing R/T procedures.
A slightly more pragmatic attitude often pays dividends. Think flexibility & common sense.
At least with an expired FAA PPL, you can start the groundschool. Probably best to take the Class one first?

View their profile, user lists, add to ignore list.