...I'd say 'that was deserved', although I really do believe Takumi just plain wasn't thinking at all when he did that.

Hiruko describes him as a 'closet degenerate' (or, whatever that was in JP- how many times is this game gonna sling the D word) so it's easy to infer that he's quite heavily repressed and lets it slip from time to time. His dishonesty with himself leaves him at odds... and funnily, he'll run the other way when Hiruko shows up in a swimsuit in the original 100 days because he can't stand to be around her

...and this, from early in the route. Redacting inside his own head??