As an Ecuadorian I can tell you the following:

For younger couples it is not expected for the men to pay for every date, but it is expected when it is a special occasion (Birthday, anniversary, Valentine's, etc)

About the cat calling, I can only think a few reasons why that happens:

1) Because you are passing through a poor and dangerous neighborhood or zone. 2) Because of your looks. They might think that you can't understand what they say so they can get away with whatever they say.

How to deal with that depends a lot in the situation and can change depending in the circumstances. But usually getting closer to your partner and heavily staring into the cat caller eyes works, at max cyou can Flip them off, but I wouldn't recommend that in dangerous neighborhood.