Do you think it’s necessary to have standards in a relationship?Why do you think some people just don’t have any standards with who they date?

Standards are important in all kinds of relationships...from family, friends, romantic relationships...etc

Some people have different standards or have lower or higher standards then others because they might value different things, or because they have low self esteem or feel intimidated. Or don't know how to have standards, or have always seen people have high standards.
What you see in relationships around you and what you experience plays a role in that.

Most of the time they suffer from extremely low self-esteem. And think that they could never do better.

What happens IF someone comes along who you brush off because of your standards BUT the 2 of you have the most compatible personalities ever

It may be necessary to an extent but setting standards can backfire . Hopefully you can live up to the standards you set for everyone else.

Past trauma or maybe they grew up in a very loose house with no standards being shown to them

I am afraid I fit in that catogary. Sometimes you just have to be particular about friends and partners.

Absolutely dating standards are very important, like having enough self-respect not to accept mistreatment.

I do think it's necessary.