It still happens “in churches” till today:
“So if the whole church comes together and everyone speaks in tongues, and inquirers or unbelievers come in, will they not say that you are out of your mind?” (1 Corinthians 14:23)
Then, what to speak “in church”?
“But in the church I would rather speak five intelligible words to instruct others than ten thousand words in a tongue.” (1 Corinthians 14:19)
If you speak in tongues “in church”, then you “must” follow His rule (below):
“If anyone speaks in a tongue, two—or at the most three—should speak, one at a time, and someone must interpret.” (1 Corinthians 14:27)
But if there is “no” interpreter, then “no” speaking in tongues is allowed “in church” (you only speak in tongues to ‘yourself & God’)
“If there is no interpreter, the speaker should keep quiet in the church and speak to himself and to God.” (1 Corinthians 14:28)
False teachers are those who teach contrary to the verses states in the Bible because only His Word is Truth (not the opinions of men).