If they're confirmed Brexiters now, they're not going to be engaged on here except to try and wind people up. They'll be on X or in Facebook groups and when you go on there, you're not going to find any elegant discussion on why they wanted to leave. Quite the opposite. Some of it is abhorrent.
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But it's harder to change if other people are calling you stupid. People need space, respect, stuff like that.
You can give them all the 'respect' you like, and good luck to you for trying to change their mind, but please don't expect people whose lives they've wrecked in the process to follow suit.