Yes, it is really none of our business if some Christians choose to speak in tongues. The only issue is the claim that you are not "Spirit-filled" if you have not spoken in *tongues*. That is pure nonsense and also false doctrine.
I do not believe I nor any one else would be against it unless believers are talking about tongues for private use. If it was really for private use, why share that at all? It's not like they can share anything with another believer that use tongues for private use, right? It's private.
But that is not what is going on here. It is by that apostasy of believing they can receive the "Holy Spirit" again apart from salvation is how they are getting that kind of tongue as found in the world that is gibberish nonsense.
So it is really about caring for the body of Christ for those that have gone astray, hoping in the Lord that God is peradventuring to recover some from that snare of the devil that are held captive to do his will ( 2 timothy 2:24-26 )rather than pray normally and get their deification by the scripture; 2 Timothy 2:15-17
Proof that one does not need another drink of the One Spirit to get any gift from the Lord Jesus Christ.
1 Corinthians 12:12 For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. 13 For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.14 For the body is not one member, but many.
Proof that tongues are not for private use.
1 Corinthians 12:7 But the manifestation of the Spirit is given to every man to profit withal.
19 And if they were all one member, where were the body? 20 But now are they many members, yet but one body. 21 And the eye cannot say unto the hand, I have no need of thee: nor again the head to the feet, I have no need of you.
Proof that we should be concern for members of the body that have gone astray, saying otherwise.
1 Corinthians 12:25 That there should be no schism in the body; but that the members should have the same care one for another. 26 And whether one member suffer, all the members suffer with it; or one member be honoured, all the members rejoice with it. 27 Now ye are the body of Christ, and members in particular. 28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues. 29 Are all apostles? are all prophets? are all teachers? are all workers of miracles? 30 Have all the gifts of healing? do all speak with tongues? do all interpret? 31 But covet earnestly the best gifts: and yet shew I unto you a more excellent way.
Which having Christ's love for one another is the more excellent way.