We know we are not perfect and it is only in Christ that we know the way to perfection. And through Christ, we are perfected.
With this basis, I believe one can discern those who love to commend or compliment people.
There are two kinds:
1. Those who do it for they truly saw God's glory.
2. Those who do it for the purpose of being hypocrites.
One should know the worth of oneself. However, when receiving positives or negatives from outside, it may be hard to discern the intention of others.
Perhaps this rule of thumb could be helpful:
A true compliment is proportional to a true criticism
Therefore, one must be careful of those who only love to compliment and never criticize. For these are very slick at using people.
And secondly, be watchful of those who love to compliment but always make false criticism.
And thirdly, of those who love to make false compliment but true criticism.
Beware of them, for the second and third groups are the jealous types.
Last but not least, be watchful of those who make false compliment and false criticism all the time, for they have no respect for themselves in the first place and therefore the respect they speak of is vain.