this

1

×  I hate reality shows. I think this TV programmes are horrible.
√  I hate reality shows. I think these TV programmes are horrible.

This is singular and these is plural.

2

× Thanks for the trip. This beach was incredible.
√ Thanks for the trip. That beach was incredible.

We can use this/those when we are using present tenses, but we must use that/those when we are using past tenses.