I believe you are conflating some arguments. You don't have to spend a large amount of money to have an outsized effect on the climate. I'd wager that a Burger King Whopper for $4.19 contributes more to climate change than a 8oz ribeye from locally raised cattle at a high-end restaurant for $39.

In this case you should spend more money on less meat. Just saying 'spend less money' continues to ignore the enternatilies that make meat production such a driver of climate change.