There's plenty of difference between most different types of pints and if you think there isn't then you're medically unwell, lacking taste buds, bonkers, or quite possibly all three.
Are you really trying to convince people that there is "no difference between" stout, lager, and beer? Or even if you accept that those are all different are you really trying to convince us that there's no difference between Murphys and Guinness, or between say Coors and Moretti??
Or could it be that you've just never had an actual pint in your life