Litvaks serve the Shulchan Aruch. Chasidim serve G-d.
chaasidim fear Hashem and litvaks fear the Shulchan Aruch
Although these lines from the first glance seem like they are mocking Litvaks, I think it sounds like he is just reiterating one of the original machlokesin between litvaks and chassidim. Namely if “lishma” means “lishem HaShem” or “lishem HaTorah”.