Actually, Pills, that pic might actually help someone to avoid making a bad, harmful decision.
If Pinkamena hadn't went on on her line of questioning, she might had just spread a rumor, but we both know what happens when a rumor is spread: Bad Stuff
Of course, the confusion itself by the end was more like drama than actual confusion for me, one could simple had stopped at "I will just tell Rarity she shouldn't be in love with another mare's stallion"... unless it is an open relationship, which is possible.
By the way, when is Pinkie Pie's birthday? If I recall well, you know the answer