Yeah, I don't think that really works unless you've got a strong wedge issue that can be used to threaten the main party.
I think you're absolutely right, we need electoral reform precisely so that more diverse views can be represented in government.
For now, though, the priority has to be ejecting the Tories.
Absolutely.
"It's just my opinion" isn't a valid defence when you should have kept that opinion to yourself.
"Your baby is ugly" might even be true, but it's not something you actually say to people.