If you're going off amount of box art appearances, Bandy doubles captain toad (though, due to not being P1, he's never front and center like Captain Toad).
Or are you saying people like Captain Toad because they think he's more relevant? While Toads may be more relevant than Waddle Dees (mainly because Mario as a series has outsold Kirby by around ten times), Return to Dreamland actually beats the original Captain Toad in sales (1.66 million vs. 1.4 million), although with the Switch and 3DS versions, Captain Toad technically did out-sell RTD (I can't find stats for the 3DS, but since the switch version has sold 340 thousand copies and the 3DS version had around 40% of the Switch version's in the first few months, so I'm guessing around 1.9 million total vs RTD's 1.66 million). Of course, if you add the 580 thousand sales of Rainbow Curse and the 1.47 million of Kirby Star allies (which actually is the fastest-selling Kirby game ever made), Bandy's playable appearances crush Captain Toad Treasure Tracker. The only way Captain Toad could be statistically more relevant than Bandana Dee is if you count him being playable in 3D World in a minigame; being a main series Mario game, it crushed Kirby's sales, which isn't uncommon.
tl;dr: Bandana Dee is relevant, people who make the dumb arguments against him support characters that people could make the same dumb arguments against (but the arguments are still really stupid), and it's impossible to hate our pure bandana boi.