Will my house be shown by other Realtors even though I am paying a flat fee?

First, no Realtor would ever know that your listing is different from any other listing. Second, assuming they could somehow tell the difference, it really wouldn’t matter anyway. All that buyers’ agents care about is getting their commission, and they WILL show your house regardless of what kind of listing it is. If they don’t show it, they risk that the buyer will find it themselves, and the agent would end up with nothing. The only agents complaining and making up blackballing stories are the ones who can’t get 6% listings so easily any more, and they don’t normally work with buyers anyway.