Try the “Broken Record” Technique
It’s OK to say to your difficult person “This isn’t a good time for me to finish this discussion” instead of getting into a confrontation that you aren’t prepared for.
When you are being railroaded into a confrontation to discuss and issue “here and now” you do not have to agree to their terms. You aren’t being difficult back, you are just taking some control over the circumstances.
Practice the “broken record” technique.
Calmly say “This isn’t a good time for me to finish this discussion” and refuse to baited into having the discussion now – especially when it isn’t a good time for you.
The best part of the broken record technique is that you don’t run out of things to say. You calmly repeat the same thing over and over again. Find a time to continue the discussion that works for both of you.
Good luck, and keep on-the-right-track this week!