A "pointless argument" is a disagreement or discussion that has no purpose or benefit. It's when people argue without any reason or chance of reaching a resolution. Full definition
Try not to get drawn into pointless arguments with them, there will be enough issues that need dealing with. (separatedfamilies.info)
As much as it's significant to speak for yourself and stand by your point, it's also necessary to avoid pointless arguments at work. (entrepreneur.com)
Meeting someone on a liberal dating site could save you a lot of pointless arguments about fake news and what exactly making America great means. (datingadvice.com)