The main lesson I'm taking from your anecdote is "people are complicated, everyone is complicated in a different way, and for almost any action or behaviour X, there will be a person somewhere who finds it awful." It's hard to guess at the relative numbers without doing a poll, but I'm guessing there's a range of people who wouldn't care if their significant other used physical affection as a reward (or who would even like it, because "yay, more total physical affection!"), and there's a range of people who would find it mildly to extremely unpleasant.