Of course it's not. The community of Sodom adopted the rainbow expressly to flaunt that OT account of Sodom and Gomorrahs destruction due to their immorality, which included homosexuality, by raising the rainbow God placed in the sky after the deluge that wiped sin from the world.
Basically the purpose of the rainbow being stolen to become the flag of Sodomites is to mock God's wiping their particular sin off the face of the earth with the flood. Because the Bible tells us God placed the

in the sky to show he would never vanquish sin,sinners, that way again.
Gays rallying behind the rainbow is intentional purposeful mockery of God. ''We're here, we're queer!''
That site I shared allows the rainbow design to transfer to car flags, shirts, license plates , license frames, posters, you name it.