I am in the promotional products industry. Among many other things I supply imprinted clothing and sportswear including t-shirts. I have a large variety of suppliers. Every one of my suppliers has a disclaimer that they have the right to refuse to print anything that violates their standards.
In our industry suppliers have always had the last word on what they will print on products.
That said most of them have jumped on the queer rainbow bandwagon because they see that as a great way to make money. The number of emails I got from suppliers pushing products with gay rainbows on them during gay pride month got to be somewhat nauseating.
The Christian symbol of the rainbow and love has been hijacked by these LGBTQ miscreants. If you do not honor them the LGBTQ miscreants will claim you hate them. The rainbow symbol used by the LGBTQ miscreants originally defined God’s message to believers.