This person doesnt understand what Bad Faith actually means. Many people including GP are now using this term as a simple perjorative just to describe things that they don't like or disagree with. Something similar has occured with the term 'gaslighting'.
They also linked to the more questionable entry on wikipedia rather than the more authoritative one. Compare https://en.wikipedia.org/wiki/Bad_faith vs https://en.wikipedia.org/wiki/Bad_faith_(existentialism)