Don't let it bother you. Many people - parents included - don't appreciate all that is involved in making a quilt and they don't understand why it's important to us. When we give a quilt as a gift, it's terrific when someone is generous in their praise and thanks, but we can't expect that reaction every time. It's probably not that they don't like the gift - they just don't understand why it's any different from the one they saw in a catalog last week.
You did a wonderful job for a first quilt. Take pride in your work and know you did a good job and you did it with love for your father. Then let it go - and don't be surprised if some day down the road, you hear from your mom or someone else just how touched your dad is to have the quilt you made with your very own hands.