Q4Women: Do you lose attraction for a man if he's with an unattractive woman?

So there's a thread currently discussed on TRP in which supposedly a woman said, "When women see a guy with an obese girlfriend, that guy basically becomes a non-entity to them -- even if he's hot."

I get to an extent that a man's value is raised when he is seen interacting with attractive women (preselection), but "her" statement implies that a woman somehow loses her physical attraction for a man based on the attractiveness of another woman.

Roissy discusses the problem of mismatched couples from a red pill perspective, but I highly doubt a man who's talking to an unattractive woman somehow "becomes a non-entity" if he looks like this, this, or this.

But I'm curious to know how women feel about the issue. If a handsome man were talking to/dating an unattractive woman, would you feel less of an attraction for him?