Bayer Leverkusen is seen in Germany as a plastic club by a lot of fans, mostly because they have distanced themselves from their working class roots. They have a family friendly atmosphere and stadium. As a result a part of the ultra fanbase is trying to distance themselves from that clean image by being edgy and coming up with shocking statements.
They have a cult mascot, "der Zitronenmann", they use as a "spokesperson to" say controversial shit trying to get attention and stay relevant. They have provoked and picked fights with rivals as well, mainly Bremen and Koln.