People are free to boycott whatever they want for whatever reason they want, and to be honest, it's pretty irrelevant what you or I think of them boycotting it.
I've boycotted Israeli goods, and companies that sustain and work with the Israeli government for as long as I can remember. I wouldn't take too kindly to someone telling me saying the things your saying (and I'm not saying this is a like for like example, but there's some overlap in terms of the agency I have in where and how I spend my money).
In large parts of the US, they're essentially Christo-fascist states, so it's not really beyond the realms of thinking that they'd boycott this, just as I imagine they'd boycott pro-Palestinian items as it'll go against their Christo-Zionist views, or the deflection and nonsense they spout, or how everything becomes about Marxism when it comes to BLM.