“The Shaptzniker, shlita, also mentions that we are noheig to serve fleishigs on Yontof, and refers to those who serve milchigs, r”l, as people who obviously do not follow the derech of their ancestors”
To use the words r”l is nothing short of nonsense (I’m trying to be careful here). The inyan on Yom Tov is simcha. Even though for most people simcha involves eating meat, for SOME PEOPLE it is the opposite. Some people abhor meat or chicken. Should they make themselves nauseated by eating meat and ruin their simchas Yom Tov, or should they have seichel and eat what they enjoy and makes them happy?