Your statements are quite general and not much substance can be attributed to it unless you give some solid evidence as to why or what was said of LineageOS/Linux that hurt your feelings. If you are merely referring to the discussions in the room about the shortcomings of the above mentioned OS/Kernel security-wise then this is just a reflection of the frustration people face with security in Linux. You didn't even bother to add some relevant quotes. And I dont know, but we rarely talk about LineageOS and maybe someone said something about it in a disparaging way when someone new to the room must have brought up the topic of lineage OS and privacy/security.
I dont know how Graphene OS has anything to do with your judgement of the developers behavior. He is quiet a reasonable person ,helps people out a lot. Anyone who comes to the matrix room with genuine interest knows that. There are of course trouble-makers who get themselves banned and then go around the internet spreading ill-will.
I dont know of anyone who was blocked because they just made technical arguments about linux phones and got blocked. It always comes down to someone shilling some linux phone, calling it more secure and distracting everyone in the room with weird conspiratorial messages. So if you know of a situation where you or anyone you know were merely making technical points about linux phones/mainline linux in some argument about some aspect of those projects and someone blocked you or accosted you please tell us here. We take care that we act in a civil manner in the room and try to have fruitful rational discussions and do not tolerate hot-blooded-loud mouthed "evangelists"