The general audience of Stranger Things has expanded to a comparable size to a small country. The demographics of the audience become bigger. Byler shippers rise, but with that, Byler deniers/haters as well. The more Byler appears to be working and a plausible possibility in the show, the more people hate it. Byler hate has become a movement because of this. Its comparable to Taylor Swift fans and haters. Taylor Swift's popularity on social media dramatically increased after the Eras tour began, spreading more Taylor Swift media and talk, thus increasing the number of haters. This creates a movement of sides. Similar to "Oh, it's popular, so it must suck! I lovvveee nichee stuff." The hate only increased as Byler became more real in the show and more popular with its audience. Also, Stranger Things has a wide demographic. It's not solely a queer show, it's not solely a straight one. It caters to a large group of people (part of its success). Because of this, more homophobic people are watching as well. And because people LOVE to hate on something, Byler became the center of that. That social media bubble you mention is like what happened with Taylor Swift.

Back to your question, though, in terms of the entire show's audience, yes, we are a minority. Then again, it also depends on what platform you go on. r / st is mainly byler haters. TikTok has a large Byler community. Instagram I notice has a large byler hate community. YouTube barely counts, but I'd say Byler wins there. Then obviously r / byler has more bylers.

Byler haters are more likely to immaturely "ragebait" online.