inviting someone to dinner (in cantonese)
介意 =  'mind' (v),
When you ask someone &quot;你介唔介意 (do you mind) doing something&quot;, you are suggesting this something might inconvenience, trouble,  or displease him or her.
&quot;你介唔介意今晚同我食飯?&quot; = &quot;Do you mind having dinner with me tonight?&quot;
It sounds less asserted. Implies having dinner with you is doing you a favor.

&quot;今晚不如同我食飯&quot; = &quot;It is better to have dinner with me tonight&quot;

It is not a proper sentence structure for requesting
You can use a requesting phrase like &quot;好唔好&quot; as in &quot;今晚同我食飯好唔好?&quot; to make it a proper request
Another way to make &quot;今晚不如同我食飯&quot; a request is to use a final particle.
Different final particle expresses different tone, emotion or meaning
Example:
&quot;今晚不如同我食飯吖&quot; -- 吖 (suggesting/ casual/ inviting)
&quot;今晚不如同我食飯啦&quot; -- 啦 (casual/ suggesting/ asserted)
There are many other ways to make an invitation. For example, '今晚一齊食飯好唔好?' or  '今晚一齊食飯啦'