It could be the correct side of the debate, but in terms of having a fair discussion it’s not playing by the rules.
When it comes to keeping the Torah, it is more important to be right than to win a debate.
People turn mainstream accepted practice on its heels all the time when they think they can prove that the practice came from a mistake or an improper reading of the Gemara or something like that.
I’d love to know which practices you refer to, but when it comes to things like horseradish and oats, which seem to have a clear mesorah, it’s very disturbing.