What should I do about my girlfriend she forced me to wear a diaper on our last road trip?

My girlfriend forces me to wear diapers on road trips because she says I take to much rest stops to pee and it wastes time. Anytime I refuse she says she will go without me. Is she being unreasonable in forcing me her mid twenties boyfriend to wear diapers to save time?
What should I do about my girlfriend she forced me to wear a diaper on our last road trip?
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