I thought David was incredibly restrained when Pip was drivelling on about 'believing in Toby
I loathe Toby and until Pip shacked up with him, I was one of the few people who actually liked her character. But David's bitching about him - starting with a dig about his being still in bed probably - was completely uncalled for. He doesn't have to be happy about her choice or to support it, but he doesn't need to be petty about it, either.
And as the still proves, he should know that Toby will find his own rope to hang himself with easily enough.