Im unpopular with the Astroists for attacking Kabrinskia......... Its like being unpopular for attacking Germany in WWII.
Well it's more like attacking Germany long before Hitler did anything wrong. Anyways, I would disagree on that being the reason. Glaumring is rather erratic, heretical, aggressive, and crazy. Glaumring was not very popular prior to his leaving SA. While disliked by SA for a long time, some recent things being him being a Cult of Bloodmoon leader, aggressive against Astrum, and explicitly stating Glaumring wished to destroy SA.