Thinning Curly Hair
A: Thinning the hair is used to reduce the amount of bulk in the hair, and most thinning techniques allow for bulk to be removed from specific areas of the hair. However, one of the side effects of thinning the hair (or over-thinning) is that the hair has fewer companion hairs to protect it from environmental factors that can cause loss of moisture.
As the hair loses condition and moisture, it can become less manageable and can curl less, instead appearing frizzed. In your situation, I recommend that you begin a routine of daily conditioning using a leave in conditioning spray, and that you use a weekly deep conditioning treatment as well. This should help to restore the moisture, elasticity and manageability to your hair.
As for future thinning of the hair, a good rule of thumb is that the hair should only be thinned every third haircut at the most frequent. You should also make certain that your stylist doesn't "over-thin" the hair when he or she performs a thinning step. Generally, one or two "snips" at different points along the hairs' lengths is all that's needed for a given slice of hair.
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See also:
How to thin out hair
Causes and treatments for hair frizz
I thinned my hair too much. How can I make it thick again?
Does my hair stay the same length as it was before when it gets thinned?