Wow! I am sooooo sorry this happened. I used to find myself in the same type situations... which trigger my PTSD.... and I couldn't even verify what I had said or done because I had flashed back or zoned out...and that is very frustrating!

You are, at least, at the point of realizing what happened, and looking for a way to handle it better NEXT TIME. Good for you!!
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There will be a next time. Plan NOW what you think you should do:
try to remain calm.
don't lower yourself to their level (you don't like their level, remember?)
do you have a camera you can carry with you, to take a picture, say, of their illegally parked car?
what do the other neighbors think of these neighbors? if there is more than one person complaining, then the police will be able to find the true problem

I'm sure there are more ideas, and maybe these will help you think of how best you should handle it.

Yeah, and take more meds so you can deal with it better next time.

<font color=blue> meditation is a true way to connect to the Source </font color=blue>