I used to take such events personally, too: I walk past a group of people - they start laughing - I interpret it that they are laughing at me. Past experiences from school made me used to this assumption being true
It took me years to stop caring.
I think it is quite likely that your mother was right - and even if she wasn't, the ones who were on the wrong were those people sitting on the bench. You are a responsible citizen. They are the the ones making UK situation worse.
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Let's not confuse being normal with being mentally healthy.
<not moderating PPR stuff concerning East Europe>