Looking on the internet deeply has found these results:

It's too bad is the most popular phrase on the web.

That's too bad 1478,000 results on the web	It's too bad 15,830,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
That's too bad, 'cause you're not doing so great. That's too bad because if we find out what casino she works at, we might have to take a field trip. That's too bad, because they got good gas prices. That's too bad nobody told his brother what he wanted. That's too bad, Mr. Worthington. That's too bad, because that was gold. That's too bad, because this gun you sold killed two men. That's too bad, because that virus would be the holy grail while this heat lasts.	It's too bad, because they're really quite friendly. It's too bad, mom, 'cause you're miserable. It's too bad I was born in Datong. It's too bad that it takes something awful for people to get together. It's too bad you're not good police. It's too bad your brother didn't fare as well. It's too bad they let Tomlinson go. It's too bad you never said anything back then.

That's too bad

1478,000 results on the web

It's too bad

15,830,000 results on the web

More popular!

That's too bad, 'cause you're not doing so great.
That's too bad because if we find out what casino she works at, we might have to take a field trip.
That's too bad, because they got good gas prices.
That's too bad nobody told his brother what he wanted.
That's too bad, Mr. Worthington.
That's too bad, because that was gold.
That's too bad, because this gun you sold killed two men.
That's too bad, because that virus would be the holy grail while this heat lasts.