In Russia, Eastern Catholics, or “graeko-catholics”, or “Uniates” are considered (by majority of orthodox people) to be even worse than Roman Catholics. They are true “traitors of Russian Orthodoxy”. And they are “wolves in sheep’ skins”, Catholics who “mimic” Orthodoxy (by keeping the rite, the Liturgy, most of the traditions etc.), but being servants of the Pope.
I used to dislike them too