Ahead of Affirm (AFRM) earnings, Matt Tuttle says he's "very, very cautious" on stocks representing low-end consumers citing the company's "buy now, pay later" business model. He admits the stock has done great, but cites a "massive headwind" being labeled as a meme stock. Matt points to a correction in the meme stocks potentially on the horizon, saying they "will sell off hard." He says Affirm's connection to Amazon (AMZN) customers bolsters its overall picture.