Mike Pence will crush him? Or are you referring to something/someone else? Didn't follow that statement....
In what I have seen of him so far, Mayor Pete (not gonna commit to trying to spell that last name accurately) seems to be minimizing the identity politics aspects of his sexual orientation and positioning himself more broadly as the candidate who is "just as progressive, but also much more practical" than Bernie, or Corey, or Kamala, or Elizabeth, etc., with a "plus, I'm a millennial, so I think like you" ("you" as in second largest voting bloc demographically) kicker, to separate himself from the other (older) candidates with executive office experience.
I see his recent statements related to Pence's purported view of gay people as a framing mechanism for the pitch he eventually has to make successfully to the many Americans who are still uncertain in how they "feel" about homosexuals: the folks who 20 to 15 years ago firmly believed gay people were "perverts", equivalent to pedophiles, but who have come to discover in the last decade or so that there seem to be a heck of a lot of "normal" gay people.
He has to convince those people that he's gay because that's how God made him, and while he is not ashamed or embarrassed of it, it is also just one of many components of the person God made him to be; it is not the animating "force" of what he is about, as a person or as a politician, any more than the fact that God made them heterosexual defines who they are.