A bit thick/strong - Idioms by The Free Dictionary
a bit thick/strong
a bit thick more than you can tolerate; unfair or unreasonable. British informal
1991 Alistair Campbell Sidewinder I thought this was a bit thick, and to begin with I tried to defend myself.
a bit ˈthick/ˈstrong (old-fashioned, British English, informal) not fair or acceptable: It’s a bit thick of him to expect me to pay every time we go out together. ♢ She said it was the worst book she’d ever read, which I think was a bit strong.