Claiming the utterance of a person on his own with his spirit as that of the Holy Spirit is blasphemy! This is not a spiritual gift as listed by Paul.
What does 1 Cor 14:2 state, 'For anyone who speaks in a tongue does not speak to people but to God. Indeed, no one understands
them; they utter mysteries by the Spirit' (NIV).
Let's get something clear, this is NOT 'the utterance of a person on his own with his spirit'. This Scripture is clear that the person who speaks in tongues, by the Holy Spirit, utters 'mysteries by the Spirit'. The person is not most definitely speaking 'mysteries' by the Spirit and that's why it needs the accompanying gift of interpretation in the public gathering.
It seems that you are engaging in eisegesis - imposing your view on the text - by making the gift of tongues equivalent to gibberish = '
nonsense, rubbish, balderdash, blather, blether. Informal
drivel, gobbledegook, mumbo jumbo, rot, tripe, hogwash, baloney, bilge, bosh, bull, bunk, guff, eyewash, piffle, twaddle, poppycock, phooey, hooey, malarkey, dribble' (Oxford dictionaries online 2018. s.v. gibberish).
This association of a genuine gift of the Spirit with poppycock, I find to be illogical and absurd.
I buy a bag of tomatoes at the supermarket and I find a rotten one in the bag - I may not see the rotten spot until I cut the tomato in half. That doesn't stop me from eating tomatoes.
One or 100 bad examples of disorder in Pentecostal/charismatic churches today should not be reason for abandoning the genuine gifts of the Spirit including the gift of tongues, which is not a known foreign language or gibberish, but is the gift of speaking 'mysteries in the Spirit' to God.
Oz