I think (broadly speaking, I’m not including an infinitesimally-small number of turnip-witted bigots), any genuine anticatholicism in Guy Fawkes’ Night has long since been lost.
What remains is very occasional, very obvious and deliberate sarcasm or irony - in the way that British humour often works: ‘Happy Catholic Persecution Day!’ someone wished me on the Saturday!
Of course, historically, it was rather different. When in 1850 Pope Pius IX restored the Catholic hierarchy - ie bishops - to England, for example, (the matter made worse by rather poorly-timed grandstanding statements by the newly-created Cardinal Nicholas Wiseman in early November), he - and the Pope - were burned in effigy along with the usual Guy, on the night of the 5th.
Meanwhile until some time in the 19th century (forget the year it was abolished), the Church of England’s Book of Common Prayer contained liturgy for a special service of thanksgiving to be held annually on November 5th, including prayers for the deliverance of the King, Lords, Church, and Commons from “Popish treachery” and elsewhere referred to the “secret contrivance and hellish malice of Popish Conspirators.” (I can’t condone the entire sentiment, of course, but no one could deny that prayer books once upon a time had a much more thrilling turn of phrase!).
However, one should point out that what Robert Catesby and his co-conspirators planned to do (and not even getting into the fact of it being domestic terrorism!) - was simply turn the status quo on its head, and ultimately create an environment ripe for the persecution of Protestants (as had been previously been experimented with under Mary I). We probably shouldn’t feel too sorry regarding the conspirators’ fates.