True, its possible that some of them aren't thick, it's not one homogenous mass. I'm sure there are one or two bright people who are genuinely invested in Reform and would consider themselves fully informed and have gone in eyes wide open. I still reckon the vast majority of them are thick though.
I suppose it all boils down to the fact that I don't have a lot of sympathy (a) for people who continually vote against their own interests and/or (b) people who don't do their homework before casting their vote. It's not difficult to read up on politicians and parties, in this day and age it's easier than ever, there is no excuse for being misinformed imo.
As for it not being how you win arguments, then that depends whether you're in it to have an argument in the first place. Me personally, I just prefer to mind my own business and make sure I can look at myself in the mirror when I vote and it ends there for me. I'm not really interested in persuading anyone to change or debate their choices, got far better things to do with my time and in most cases it's going to be utterly futile anyway.