I think someone shouldn't have a full blown wedding if they don't even have $300 to their name
Why does it matter how much they spend?
You need to save more money just in case of emergency
I can understand your point about money, but it's rude to judge people for holding an event that to them is special. You shouldn't worry about what someone else does and only address things that affect you.
I will judge who I want because they are irresponsible with money.
You are not responsible for how other people spend or handle their money and it is inconsiderate to give them your two cents about spending money on their own wedding. Worry about your own finances instead.