Usually a reaction like that only happens when something has happened to hurt the dog. If he allows you to trim certain parts and not others then he is showing fear. I'm sure you never hurt him on purpose but something is stressing him. Maybe try taking him to a groomer to just have his feet and face trimmed and see how he does.
My Shih Tzu used to be terrible about letting us trim his nails. Three of my kids would try to hold him while I tried to trim his nails and he would fight like crazy and try to bite me. We finally took him to a nice groomer who agreed to try to trim his nails. I was a nervous wreck. I waited out in another room and my daughter went in the grooming room with him. That little stinker stood like a pro on that grooming table and let that groomer trim his nails with no problem. My daughter came and got me and told me to watch. I could hardly believe my eyes!
The next time I took him they did not even use the noose on him!
Gracie hates having her face trimmed. I only do a small area just in the inner corner of her eyes. I hold the fur on her chin firmly so she cannot turn her head either way as I trim. I use the round tipped scissors as they are much safer to use near the eyes.
Sometimes we just don't know what is going on in the brains of these little dogs but I am convinced that pets do not have the vindictive attributes that some humans try to accuse them of. The are very smart but do not have the complexity of thought it takes to be evil or vindictive.