Have you been experiencing that lately that people are always late to always late for meetings? That's the law of attraction in action; somehow you haven't been true to your own values.
It's never about the other people really; it's about us being firm and clear about what we want and staying true to ourselves.
And we are the ones who teach others how to treat us, it's we that need to set up some boundaries and let others know about them.
We don't need to tell them about our preferences or anything, but we do need to act accordingly to what is true to us.

It's by how we treat ourselves that we show others how they can treat us.

Where in your life do you feel disrespected in some way? Can you see that it's about you and your own self-respect? Where can you set some clear rules and boundaries that can help others to see what's important to you? The other person may never respect you; that's not what this is about - it's about you respecting you.
It's about making the choice to surround ourselves with people who do respect us, and who respects our time by being on time.
I understand that one can sometimes be a bit late, but if you see a pattern, trust it and make it clear from the beginning what you are all about to the other person.
For me, it only shows that something or someone else was more important, because we are always making a choice based on what is most important to us.
At all times.
Not everyone shares the same values obviously, but then again; for me it's really important - I feel there's a lack of integrity when people are late 'all the time'.
Are you respecting and valuing your time?