If it's personal preference or like/dislike of a protector, perhaps it is not such a big deal, but this is not the case.
I remember the admin posted this before, so I would like to repost here for everyone's reference:
While the Sixteenth Karmapa (the previous Karmapa) was on a pilgrimage in Nepal he stopped at Urgyen Rinpoche’s new monastery. At that time the Nepalese king and queen were there and came out to greet him with a scarf. When he went into the monastery there was a statue of Guru Dragpo with Dharmapala Shugden being pressed down under the statue’s feet. The Karmapa stood in the presence of the statue for awhile, then pointed his finger at it and asked “who is the person that said to build this statue? This isn’t Nyingma nor Sakya, certainly not Gelug and not Kagyu either. I didn’t say to build it, this is not one of the deities you can’t rely on.
Although the time is a little early in the future you will definitely need to rely on this deity.” Out of all the abbots and masters present not one came forward to answer. The Karmapa said “remove this now.” Immediately a person with an axe and shovel came and had to remove it. Many lamas present at that time definitely remember, a seventy five year old man from Chamdo called Samcho witnessed this event. - from Kyabje Dagom Rinpoche's sungbumThe first four pictures below are some pictures of the opening in 1976. Now, the founder of the monastery above is Kagyu, and the monastery was built under the direction of the 16th Karmapa, following the 'new treasures of Chokgyur Lingpa'. Hence, the Karmapa has a "say" during the opening. What does a Kagyu monastery have against a protector of another lineage? It seems rather odd.
The Nyingma monastery in Pharping, as far as I know, it only started building around 10 years ago and follows the Ripa lineage. I am not sure whether the Dorje Drolo is still stepping on a monk, but I have seen the initial drawings of the statues. I have included 2 drawings with the recent pictures below. If the Karmapa disapproved of the particular form, why is it still being made then (10 years back) and now?
I could be wrong, but perhaps this is just plain politics, especially in Nepal where all schools of Buddhism and monasteries are out there to compete for survival, earning tourist bucks and the support of local community is more important than real Buddhadharma? However, this does not justify the derogatory portrayal of another lineage's protector, definitely un-Buddhist?
I hope the time that Karmapa's prophecised will come soon.